Gardner Denver high-pressure air compressors are specifically designed for the PET bottle blowing industry has been and is being widely applied in plastic bottle manufacturing plants worldwide. Previously, bottle blowing systems mainly used flow máy nén piston không dầu Belliss & Morcom – a brand under the Gardner Denver group – is renowned for its high durability and ability to provide a stable supply of clean air at high pressure.

2023, Gardner Corporation, Denver ra mắt thế hệ brand new oil-free high-pressure air compressor, ứng dụng advanced Z-axis technology, specifically developed for the PET bottle blowing industry, this product line offers superior performance, reasonable investment costs, and optimal energy savings throughout operation.

With the design 100% oil-free, the machine ensures supply absolutely clean compressed air, meeting stringent standards in the food and beverage industry. At the same time, the stable high-pressure system operates safely and continuously, helping PET bottle blowing plants achieve high productivity, reduce maintenance costs, and improve production reliability.

Overview of Gardner Denver air compressors for PET bottle blowing

Gardner Denver air compressor is a leading global brand in the field oil-free air compressors and industrial air solutions, trusted in various industries food, beverages and plastic packaging.

The single-stage oil-free air compressor, pressure 30–40 bar Gardner's Denver was developed specifically for:

• High-speed PET bottle blowing line
• The soft drink, mineral water, and bottled beverage industry.
• The system requires food-grade clean compressed air.

Why is it mandatory to use a high-pressure, oil-free air compressor for blowing PET bottles?

During the PET bottle blowing process:

• Contact compressed air directly with the inside surface of the bottle
• Even a tiny amount of oil can cause the gas stream and contaminate the product.
• Violation of standards food and beverage safety

Gardner Denver oil-free air compressor 30–40 bar ensure:

• Absolutely clean compressed air (Oil-free)
• No complex oil filtration system required.
• Protecting the brand and the quality of the final product.

High-pressure, two-stage compression technology – Leading in performance.

Gardner Denver high-pressure air compressor applications two-stage compression technology advanced technology delivers superior performance and maximum reliability in applications requiring continuous high pressure.

High performance
The compression process is divided into two stages, allowing for high pressure to be achieved without increasing motor power. This results in higher compressed air production efficiency and lower power consumption.

Optimal cooling capacity
The compressed air after stage 1 is cooled before entering stage 2. This helps reduce the temperature of the compressor head, improving working conditions and enhancing the overall efficiency of the machine.

Exceptional durability
Distributing the compression pressure across two stages reduces the load on each compressor head assembly, thereby extending component lifespan and increasing stability during long-term operation.

Next-generation compressor technology

• Screw shaft made from stainless steel and copper alloys, high durability
• Special ceramic bearings ensure stable water lubrication.
• There is no metal-to-metal contact in the compression chamber.
  → Helps reduce friction, increase efficiency, and extend the lifespan of the compressor head.

Smart recirculating water system

• Integrated water purification system:

  • Clean water generator

  • Water filter

  • Water-air separator

• Provides purified water for cooling and lubrication.
• Water is automatically circulated according to the set cycle.
• Operating temperature must always be ≤ 50°C
  → Prevents scale buildup, maintains water quality, and protects the system in the long term.

Smart startup and control

• No peak startup line is present.
• Reduce electricity consumption during light load operation.
• Flexible control with an unstable voltage range.
• Low starting torque → reduced mechanical shock → increased bearing life
• The inverter adjusts torque according to actual needs → no energy wasted.

Output pressure is stable

• Variable frequency drive control maintains pressure with an error margin of only ±0.1 bar.
• No large-capacity gas storage tank is required.
• Pressure does not exceed the set threshold → optimizes power consumption.

Technical specifications of GDK line specialized for PET bottle blowing technology, working pressure 30 - 40 bar.

Inverter / Air-cooled series

Model	Displacement	Pressure	Power	Adaptor Diameter	Noise	Dimensions (L x W x H)	Weight	Cooling water*
	m³/min	barg	kW	inch	dB(A)	mm	kg	t/h
DH45VSD-30A/W	1.4-4.5	30	30+15	1"	65	2900x1400x1700(A) / 3000x1400x1700(W)	1480	9
DH55VSD-40A/W	1.4-4.5	40	30+22	1"	65		1520	10
DH55VSD-20A/W	1.8-6.0	20	37+15	1"	70		2000	12
DH60VSD-30A/W	1.8-6.0	30	37+22	1"	70		2000	12
DH65VSD-40A/W	1.8-6.0	40	37+30	1"	70		2100	15
DH75VSD-20W	3.0-10.0	20	55+22	1 1/4"	73	3500x1500x1730	2400	17
DH90VSD-30W	3.0-10.0	30	55+37	1 1/4"	73	3500x1500x1730	2300	17
DH110VSD-40W	3.0-10.0	40	75+37	1 1/4"	73	3500x1500x1730	2400	20
DH110VSD-20W	3.8-13.0	20	75+30	1 1/2"	75	3500x1500x1730	2500	22
DH120VSD-30W	3.8-13.0	30	75+45	1 1/2"	75	3500x1500x1730	2500	22
DH135VSD-40W	3.8-13.0	40	90+45	1 1/2"	75	3500x1500x1730	2650	24
DH130VSD-20W	5.0-16.0	20	90+37	1 1/2"	76	4000x1700x1800	3200	27
DH145VSD-30W	5.0-16.0	30	90+55	1 1/2"	76	4000x1700x1800	3200	27

DH165VSD-40W	5.0-16.0	40	110+55	1 1/2"	76	4000x1700x1800	3200	35
DH165VSD-20W	6.1-20.0	20	110+55	2"	76	4000x1700x1800	3600	35
DH185VSD-30W	6.1-20.0	30	110+75	1 1/2"	76	4000x1700x1800	3600	35
DH210VSD-40W	6.1-20.0	40	132+75	1 1/2"	76	4000x1700x1800	3800	38
DH200VSD-20W	7.0-24.0	20	132+65	2"	77	4000x1800x2100	4200	38
DH220VSD-30W	7.0-24.0	30	132+90	2"	77	4000x1800x2100	4200	38
DH250VSD-40W	7.0-24.0	40	160+90	2"	77	4000x1800x2100	4300	45
DH230VSD-20W	8.5-28.0	20	185+45	2 1/2"	78	4200x2000x2100	4600	46
DH260VSD-30W	8.5-28.0	30	185+75	2"	78	4200x2000x2100	4600	46
DH290VSD-40W	8.5-28.0	40	200+90	2"	78	4200x2000x2100	4600	55
DH300VSD-20W	9.5-36.0	20	185+110	2 1/2"	80	4500x2250x2200	5000	50
DH315VSD-30W	9.5-36.0	30	185+132	2 1/2"	80	4500x2250x2200	5000	60
DH355VSD-40W	9.5-36.0	40	200+160	2 1/2"	80	4500x2250x2200	5000	68
DH330VSD-20W	10.0-40.0	20	220+110	2 1/2"	80	4500x2250x2200	5000	65
DH355VSD-30W	10.0-40.0	30	220+132	2 1/2"	80	4500x2250x2200	5000	70
DH400VSD-40W	10.0-40.0	40	220+185	2 1/2"	80	4500x2250x2200	5000	85

Operating principle in PET bottle blowing systems

• Compressed air is compressed high pressure 30–40 bar
• Directly supplied to the bottle blowing machine.
• Stable pressure helps PET bottles are uniform and maintain their shape well.
• Reduce product defects and waste.

As a result, the entire bottle blowing line is operational efficient, stable, and cost-effective.

Practical applications Gardner Denver oil-free high-pressure air compressors are widely used in:

• Beverage factory
• Pure water and mineral water factory
• PET bottle manufacturing facility
• High-speed blow molding line

According to feedback from the operations engineer, the system helps ensuring consistent bottle quality, reducing production errors, and optimizing energy costs.